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diff --git a/fxjs/cjs_runtimestub.h b/fxjs/cjs_runtimestub.h
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+++ b/fxjs/cjs_runtimestub.h
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+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef FXJS_CJS_RUNTIMESTUB_H_
+#define FXJS_CJS_RUNTIMESTUB_H_
+
+#include <memory>
+
+#include "core/fxcrt/fx_string.h"
+#include "core/fxcrt/unowned_ptr.h"
+#include "fxjs/ijs_runtime.h"
+
+class CPDFSDK_FormFillEnvironment;
+class IJS_EventContext;
+
+class CJS_RuntimeStub final : public IJS_Runtime {
+ public:
+  explicit CJS_RuntimeStub(CPDFSDK_FormFillEnvironment* pFormFillEnv);
+  ~CJS_RuntimeStub() override;
+
+  IJS_EventContext* NewEventContext() override;
+  void ReleaseEventContext(IJS_EventContext* pContext) override;
+  CPDFSDK_FormFillEnvironment* GetFormFillEnv() const override;
+
+#ifdef PDF_ENABLE_XFA
+  bool GetValueByNameFromGlobalObject(const ByteStringView&,
+                                      CFXJSE_Value*) override;
+  bool SetValueByNameInGlobalObject(const ByteStringView&,
+                                    CFXJSE_Value*) override;
+#endif  // PDF_ENABLE_XFA
+
+  int ExecuteScript(const WideString& script, WideString* info) override;
+
+ protected:
+  UnownedPtr<CPDFSDK_FormFillEnvironment> const m_pFormFillEnv;
+  std::unique_ptr<IJS_EventContext> m_pContext;
+};
+
+#endif  // FXJS_CJS_RUNTIMESTUB_H_